<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
var a=13;
/*
if (a%2==0)
{
	alert('双数');
}
else
{
	alert('单数');
}*/
a%2==0?alert('双数'):alert('单数');
//条件？语句1：语句2--->同结果
</script>

</head>

<body>
</body>
</html>
